Rob Kardashian
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Rob made the NSFW confession in a phone call when Khloé asked him to be Malika Haqq's sperm donor.
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Caitlyn admitted that she and her ex-wife no longer speak, describing their relationship as "sad."
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Caitlyn, who was married to The Kardashians star until 2015, admitted her current situation with Kris is "sad."
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The three-part documentary takes an in-depth at the Kardashian family dynasty, as told by some of those closest to the Kardashian-Jenner crew.
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"He talks about it a lot," Khloé reveals.